class email
{
     
//通过sock发送e_mail，不支持附件，
//-------------------------------------------------------------------------------------------------------
    function email_sock($host,$port,$errno,$errstr,$timeout,$auth,$user,$pass,$from)//构造函数
    {
		$this->host    = $host;
		$this->port    = $port;
		$this->errno   = $errno;
		$this->errstr  = $errstr;
		$this->timeout = $timeout;
		$this->auth    = $auth;
		$this->user    = $user;
		$this->pass    = $pass;
		$this->from    = $from;
	}
	
	function send_mail_sock($subject,$message,$to,$from_name,$mailformat=0)//邮件标题,邮件内容,收件地址,邮件格式1=text|0=html,默认为0
	{
	   $host    = $this->host;
	   $port    = $this->port;
	   $errno   = $this->errno;
	   $errstr  = $this->errstr;
	   $timeout = $this->timeout;
	   $auth    = $this->auth;
	   $user    = $this->user;
	   $pass    = $this->pass;
	   $from    = $this->from;
	   	   
	   /*
	   1.创建sock，并打开连接
	   2.设置为阻塞模式
	   3.测试smtp应答码是否为220，220代表邮件服务就绪
	   4.发送用户身份验证，由用户设置
	       1=EHLO Host Domain \r\n
		   0=HELO Host Domain \r\n
	   ?.读取服务器端发送给客户端的返回数据
	     smtp.163.com 发送的数据为：
		    250-PIPELINING//流水命令，告诉客户端可以一次发送多个命令来提高速度，在这里PHP
			                并没有使用，因为PHP单个文件的运行还是单线程的
		    250-AUTH LOGIN PLAIN
		    250-AUTH=LOGIN PLAIN
			250 8BITMIME//得到这一行也就是smtp服务器发送结束了，等待客户端发送命令
	   5.发送AUTH LOGIN命令
	   6.发送用户名
	   7.发送密码
	   ?.身份验证过成功后后，
	   8.向服务器添加from
	   9.向服务器添加to
	   10.发送DATA命令,开始输入email数据,以"."号结束
	   11.书写邮件内容
	   12.将邮件内容发送到smtp服务器
	   13.发送QUIT命令，结束会话
	   */  
	   	   $fp = fsockopen($host,$port,$errno,$errstr,$timeout);//打开sock的网络连接
		   if(!$fp){return '1.没有设置好smtp服务';}
		   		   
		   stream_set_blocking($fp, true);//设置为阻塞模式,此模式读不到数据则会停止在那
		   
		   $mail_return=fgets($fp, 512);//读取512字节内容
		   if(substr($mail_return, 0, 3) != '220')
		   {return $host.'-2.返回应答码为'.substr($mail_return, 0, 3);}//返回应答码所代表意思请参考'smtp协议.txt'
		   		   
		   
		   fputs($fp, ($auth ? 'EHLO' : 'HELO')." ".$host."\r\n");//服务器标识用户身份 1=身份验证的标识,0=不需要身份验证的标识
	       $mail_return = fgets($fp, 512);
		   if(substr($mail_return, 0, 3) != 220 && substr($mail_return, 0, 3) != 250)
		   {return $host.'-3.返回应答码为'.substr($mail_return, 0, 3);}
		   
		   while(true)
		   {
            $mail_return = fgets($fp, 512);
				if(substr($mail_return, 3, 1) != '-' || empty($mail_return))
		        {break;}
	       }	   		
		   
		   
		   if($auth)
		   {
		      fputs($fp, "AUTH LOGIN\r\n");
			  $mail_return = fgets($fp, 512);
			    if(substr($mail_return, 0, 3) != 334) 
				{return $host.'-5.返回应答码为'.substr($mail_return, 0, 3);}
				
			  fputs($fp, base64_encode($user)."\r\n");
			  $mail_return = fgets($fp, 512);
			    if(substr($mail_return, 0, 3) != 334) 
				{return $host.'-6.返回应答码为'.substr($mail_return, 0, 3).'user='.$user;}
				
			  fputs($fp, base64_encode($pass)."\r\n");
			  $mail_return=fgets($fp, 512);
			    if(substr($mail_return, 0, 3) != 235)
		        {return $host.'-7.用户验证失败，应答码为'.substr($mail_return, 0, 3);}
		   }
		   
//向服务器添加FROM and TO
//------------------------------------------------------------------------------------------------------------------------
		        fputs($fp, "MAIL FROM: ".$from."\r\n");//有两种格式，MAIL FROM:xxx@xx.com和MAIL FROM: <xxx@xx.com>
		       	$mail_return = fgets($fp, 512);
			   	if(substr($mail_return, 0, 3) != 250)
				{
		       	   	fputs($fp, "MAIL FROM: <".$from.">\r\n");
		          	$mail_return = fgets($fp, 512);
		   	      	if(substr($mail_return, 0, 3) != 250)
					{return $host.'-8.返回应答码为'.substr($mail_return, 0, 3);}
		       	}
								
				foreach(explode(',', $to) as $mailto)
				{
					$mailto = trim($mailto);
					if($mailto)
					{
						fputs($fp, "RCPT TO: ".$mailto."\r\n");
						$mail_return = fgets($fp, 512);
						if(substr($mail_return, 0, 3) != 250)
						{
							fputs($fp, "RCPT TO: <".$mailto.">\r\n");
							$mail_return = fgets($fp, 512);
							  if(substr($mail_return, 0, 3) != 250)
					          {return $host.'-9.返回应答码为'.substr($mail_return, 0, 3);}
						}
					}
					
				}
//------------------------------------------------------------------------------------------------------------------------
        	fputs($fp, "DATA\r\n");//开始输入email数据,以"."号结束
        	$mail_return = fgets($fp, 512);
			if(substr($mail_return, 0, 3) != 354)
			{return $host.'-10.返回应答码为'.substr($mail_return, 0, 3);}
	
			//邮件内容
			//-----------------------------------------------------------
			     $mail_message           = "From:".$from_name.'<'.$from.">\r\n"; 
			     $mail_message          .= "To:".$to."\r\n"; 
			     $mail_message          .= "Subject:".str_replace("\n",' ',$subject)."\r\n"; 
			     if($mailformat==1)
				{$mail_message          .= "Content-Type: text/html;\r\n"; }
			     else
				{$mail_message          .= "Content-Type: text/plain;\r\n";} 
        // $mail_message          .= "charset=gb2312\r\n\r\n"; 
			     $mail_message          .= $message; 
				 $mail_message          .= "\r\n.\r\n"; 
		    //-----------------------------------------------------------
			
			fputs($fp,$mail_message);
			fputs($fp,"QUIT\r\n");
			
			return 1;
	}
}